[and at that question, her expression hardens, and her hand stops in his hair again]

Yes.

[this just took a turn into seriousville, apparently]

Spyrix is technology that casts amplified spirit artes for the user. The process drains spirits of their mana and kills them. I've spent a good portion of the time I was living among humans destroying such technology. Its existence was a danger to both humans and spirits alike.